(19)

(11)

EP 3 973 378 A1

(12)

(43) Date of publication: 30.03.2022 Bulletin 2022/13 (21) Application number: 19935505.8 (22) Date of filing: 23.12.2019

(51) International Patent Classification (IPC):  G06F 3/06(2006.01) (52) Cooperative Patent Classification (CPC): G06F 3/0689; G06F 3/0604; G06F 3/0635; G06F 2206/1012; G06F 3/0629; G06F 11/2005 (86) International application number: PCT/CN2019/127446 (87) International publication number: WO 2020/258780 (30.12.2020 Gazette 2020/53)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 24.06.2019 CN 201910551512 (71) Applicant: Zhejiang Dahua Technology Co., Ltd. Hangzhou, Zhejiang 310053 (CN)	(72) Inventors: FENG, Guobao Hangzhou, Zhejiang 310053 (CN) WEI, Qiliang Hangzhou, Zhejiang 310053 (CN) YU, Honghao Hangzhou, Zhejiang 310053 (CN) (74) Representative: Wang, Bo  Panovision IP Ebersberger Straße 3 85570 Markt Schwaben 85570 Markt Schwaben (DE)